docs: def Froude(V, L, g=g, squared=False):
      r'''Calculates Froude number `Fr` for velocity `V` and geometric length
      `L`. If desired, gravity can be specified as well. Normally the function
      returns the result of the equation below; Froude number is also often
      said to be defined as the square of the equation below.
  
      .. math::
          Fr = \frac{V}{\sqrt{gL}}
  
      Parameters
      ----------
      V : float
          Velocity of the particle or fluid, [m/s]
      L : float
          Characteristic length, no typical definition [m]
      g : float, optional
          Acceleration due to gravity, [m/s^2]
      squared : bool, optional
          Whether to return the squared form of Froude number
  
      Returns
      -------
      Fr : float
          Froude number, [-]
  
      Notes
      -----
      Many alternate definitions including density ratios have been used.
  
      .. math::
          Fr = \frac{\text{Inertial Force}}{\text{Gravity Force}}
  
      Examples
      --------
      >>> Froude(1.83, L=2., g=1.63)
      1.0135432593877318
      >>> Froude(1.83, L=2., squared=True)
      0.17074638128208924
  
      References
      ----------
      .. [1] Green, Don, and Robert Perry. Perry's Chemical Engineers' Handbook,
         Eighth Edition. McGraw-Hill Professional, 2007.
      .. [2] Cengel, Yunus, and John Cimbala. Fluid Mechanics: Fundamentals and
         Applications. Boston: McGraw Hill Higher Education, 2006.
      '''
      Fr = V/(L*g)**0.5
      if squared:
          Fr *= Fr
      return Fr